The tittle says 110 mm long but the image says 123, shall I trust its a 110mm ?

Different lengths may be available depending on the part number chosen. The same image may be used for multiple products of similar type.

Is this equal to a shiman0 un26, 68x127,5mm bottom bracket.

Please watch RJ the bike guy's How To Upgrade Vintage Bike With Sealed Cartridge Bottom Bracket in YouTube

Will this fit a mongoose sycamore 26in mountain bike

when you remove the old one read the dimensions on the bb. you can even take a measuring tape and measure the hole. don't throw away the used one until the new one is found and installed. maybe youtube your bike repair.

ASIN	B08C786DW8
Best Sellers Rank	#78,555 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #16 in Bike Bottom Brackets
Brand Name	SHIMANO
Color	Black
Customer Reviews	4.5 4.5 out of 5 stars (329)
Date First Available	November 17, 2009
Included Components	Bottom Brackets
Item Dimensions LxWxH	5.63 x 2.03 x 1.91 inches
Item Package Dimensions L x W x H	6.61 x 2.17 x 1.93 inches
Manufacturer	Shimano
Material	Alloy
Model Name	Bsa 68mm, Spindle: 122.5mm
Number of Items	1
Package Weight	0.3 Kilograms
Part Number	EBBUN300B22X
Size	One Size
Sport Type	Cycling
Style	Bottom Bracket
Suggested Users	unisex
Warranty Description	Limited Warranty

SHIMANO UN300 English Bottom Bracket

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